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34 votes
Accepted

Time for a new tyre?

Normally safe is relative, in this case, its absolute - no, it is not safe. Don't ride on that tire. I would - but only to get home, and I would be feeling for any sign of further degradation (...
mattnz's user avatar
  • 51k
25 votes

Staying out of the blind spot of a truck that has camera "mirrors"?

Never¹ stop besides a truck, even if they have mirrors and cameras all over the place. You don't know if the driver pays any attention to their mirrors. To reduce the risk of a truck stopping besides ...
gerrit's user avatar
  • 3,937
19 votes

Is it safe to have pedal cage reaching wheel when slightly turned?

Even if the cage weren't there, your foot would still be there. This foot overlap is annoying, but not very harmful. It only happens at very low velocities and during sharp turns and therefore you can ...
Vladimir F Героям слава's user avatar
18 votes

Staying out of the blind spot of a truck that has camera "mirrors"?

I for my part is a little worried about the phrase "[...] make eye-contact with a driver in the mirrors, I know for sure I am seen". I'll claim that he can have looked at something else, and ...
Klaus Nielsen's user avatar
17 votes

What camera could I mount or rig to my bike that can read/recognize license plates

The only thing I care about is getting the license plates, I don't care about quality or anything else as long as it can get the plates. A camera with recognition software would be a major plus, as I ...
juhist's user avatar
  • 19.5k
13 votes

What is a safe weight for front rack + luggage for a steel race bike fork?

An axle-mounted rack on a steel fork will handle a tremendous amount of weight. For example, Old Man Mountain's Divide rack is rated for 32 kg when mounted on the wheel axle even when mounted on a ...
SimonL's user avatar
  • 1,083
12 votes

Time for a new tyre?

No, this would probably not be "safe" to ride on. That "white stuff" looks like the casing threads(the T in TPI when you buy tires) that gives the tire its structural strength. You ...
WornChain's user avatar
  • 1,914
12 votes

Staying out of the blind spot of a truck that has camera "mirrors"?

Edit: I don’t think trucks are special. Their blind spots are bigger but a car driver or even a cyclist can overlook you just the same through inattentiveness when taking a turn. If anything, I think ...
Michael's user avatar
  • 28.1k
11 votes

Bike too large, if I change the wheels to a smaller size will this lower the height?

There are several issues worth addressing. The frame is too big, when I stand on the bike, off the seat, my toes only just touch the ground. I'm not thinking this is safe to ride around London. When ...
Weiwen Ng's user avatar
  • 32.7k
11 votes
Accepted

Is it unsafe to put a stoker stem on the front?

I've used stoker stems on recumbents to optimise the fit, and they work no better or worse than a normal threadless stem. Two gotchas though - there's an extra point of adjustment for length, so ...
Criggie's user avatar
  • 126k
11 votes

Accidentally punctured through aluminum frame with a screw tip - still safe? Repairable?

Can it be repaired? No. In general, an Aluminium frame shouldn't be welded after the initial manufacture due to the risk of local cracking and embrittlement. Factory frames are heat treated post ...
Warren Burton's user avatar
10 votes
Accepted

When does the braking power stop scaling with Rotor Size

"wouldn't that be fundamentally limited by the friction between the ground and the rider" - no. The most common limit is the rotational force from the torque generated between the ground/...
mattnz's user avatar
  • 51k
10 votes

What is a safe weight for front rack + luggage for a steel race bike fork?

Another consideration is handling - adding weight around a fork/bars negatively impacts how fast you can turn the bars, and can also vary the effects of rake and trail altering the effective geometry. ...
Criggie's user avatar
  • 126k
10 votes

What camera could I mount or rig to my bike that can read/recognize license plates

There are no cameras I am aware of that can "read" a license plate and produce that data directly as text. Not sure that it would be any use. Instead - aim to get the best quality footage ...
Criggie's user avatar
  • 126k
9 votes

Started to drill into alu frame - how bad is it?

Since this is on the central vertical tube of the bike that carries your weight on top of it, I'd say that this is just cosmetic. This tube not under tensile load, so it is not prone to fatigue ...
cmaster - reinstate monica's user avatar
9 votes

Is it safe to have pedal cage reaching wheel when slightly turned?

It's a subjective question that each rider has to answer themselves. You get to decide how safe it is. It is not unequivocally safe, but many riders ride bikes with this much toe overlap or worse. The ...
Nathan Knutson's user avatar
9 votes

Time for a new tyre?

I know from personal experience that a tyre like that fairly rapidly leads to a tyre that lets the inner tube reach the road, and that leads to a no air situation in pretty short order. Mine went from ...
houninym's user avatar
8 votes

When does the braking power stop scaling with Rotor Size

While other answers are correct in their assessment of peak braking power and its limits, that's not the most significant reason for fitting bigger rotors in many cases. Sustained braking power is a ...
Chris H's user avatar
  • 60.1k
8 votes
Accepted

What is a safe weight for front rack + luggage for a steel race bike fork?

I would have no concern about the fork's ability to carry this load. Also, consider this: nearly all the weight is going to be transmitted directly to the axle, bypassing the fork entirely. The mount ...
Adam Rice's user avatar
  • 30.1k
8 votes

What is the role of the "safety plate" on a Shimano Hollowtech II crank?

It tries to prevent incorrect assembly. The axle has an indent to accommodate the pin of the safety plate. If you do not push the crank arm all the way onto the axle, the safety plate will not sit ...
g.kertesz's user avatar
  • 287
8 votes
Accepted

Material chipping from fork dropout. Still safe?

Based on the photo, I would seriously contemplate getting a different fork. It appears as though the aluminum has undergone some galvanic corrosion. Some sort of corrosion has eaten a few chunks out ...
Jeff's user avatar
  • 10.8k
7 votes

Bike too large, if I change the wheels to a smaller size will this lower the height?

Being able to touch the ground while sitting on the saddle is not a criterion. When you stop you are supposed to move in front of the saddle. If you are in front of the saddle and unable to stand on ...
Michael's user avatar
  • 28.1k
7 votes
Accepted

How long can I use a bicycle helmet?

Your foam is cracked, and it may not be able to perform as designed in the event of an impact. Replace that helmet at the first possible opportunity and refrain from riding with that helmet. It pays ...
Criggie's user avatar
  • 126k
7 votes
Accepted

Recommended wall thickness on rims with caliper brakes

Many wheels have wear indicators From documentation resources of Shimano's R5000 wheels: https://si.shimano.com/en/pdfs/si/4BG0B/SI-4BG0B-001-ENG.PDF The hollow on the opposite side to the valve ...
DoNuT's user avatar
  • 4,496
7 votes

Staying out of the blind spot of a truck that has camera "mirrors"?

Your initial techniques are still perfectly valid. Downside is there's no feedback to you because cameras are one-way devices where mirrors were two way. Its the same as heavy window tint when you ...
Criggie's user avatar
  • 126k
7 votes
Accepted

How far a damaged rim can be taken safely

It’s impossible to say scientifically, but chances are the damage is not material. You can exercise watchful waiting. That is, leave this photo up, and check back next week to see if anything looks ...
Weiwen Ng's user avatar
  • 32.7k
6 votes
Accepted

Did this part come from my bicycle?

If you check this video: Youtube, "Installing a Bontrager Duotrap S Sensor on a Trek Domane": At 1:32, the guy who's installing the Duotrap holds a rubber ...
MagnusK's user avatar
  • 846
6 votes

How unsafe is it to ride a bike with this dent in aluminium top tube?

I did not risk it. Like Nathan suggested, I contacted Canyon and described the situation. They were kind enough to instruct me to not descend on the top tube and offered a crash replacement frame for ...
Ivan's user avatar
  • 661
6 votes

Safe to remove plastic chainring cover?

At first it seemed to me that the cover of that model is there mainly for visual purpose, as its diameter is smaller than the outer chainring. But then I discovered that your model, on the plastic ...
Robert's user avatar
  • 2,069
6 votes

What is the role of the "safety plate" on a Shimano Hollowtech II crank?

The Park Tool site on step 3a for "Crank Removal and Installation: Two-Piece Compression Slotted" says: For Shimano® Hollowtech® II, inspect for a “stop plate” inside the left arm slot. Use ...
David D's user avatar
  • 21.9k

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